You may want to try a specialised partition-recovery programs rather than a general data recovery package. For example, Easeus Partition Recovery. Also, hard drive OEMs such as Seagate offer recovery utilities for that purpose.
This will probably only work on their drives, so you will first need to find out what hard drive is in your Buffalo drive (Buffalo only make the case, not the actual drive).

Stay See K

March 15, 2014 at 2:27 pm

How would I know what actual drive is inside? I can't open the Hard drive.

Bruce E

March 15, 2014 at 11:46 pm

You can use the trial version of HD Sentinel to get information about all of your installed/connected drives, including manufacturer, model number, serial number, partition information, etc.